<div data-dojo-attach-point="containerNode">

  <div data-dojo-type="esri/dijit/metadata/form/iso/ObjectReference"
    data-dojo-props="target:'gmd:extent',minOccurs:0,showHeader:false">
    <div data-dojo-type="esri/dijit/metadata/form/iso/AbstractObject"
      data-dojo-props="target:'gmd:EX_Extent',minOccurs:0">
      <div data-dojo-type="esri/dijit/metadata/types/iso/gmd/extent/GeographicElement"></div>
      <div data-dojo-type="esri/dijit/metadata/types/iso/gmd/extent/TemporalElement"></div>
    </div>
  </div>

</div>